IEnumerable support in StaticGenerator

[tg123]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

    // public List<string>? MyList { get; set; }
    public IEnumerable<string>? MyList { get; set; }

allow IEnumerable/IReadOnlyList/IList in StaticGenerator

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